Examlex
Sleep research has continually shown that children spend more of their night getting deep sleep than do adults. This deep sleep corresponds to what stages of sleep?
Excitation-Coupling
The process linking muscle fiber excitation to contractions via the transduction of electrical signals to mechanical actions.
Refractory
Resistant to treatment or control, often used to describe a period of unresponsiveness or insensitivity to stimuli.
Power Stroke
The phase in muscle contraction where the myosin head pivots, pulling the actin filament towards the center of the sarcomere, shortening the muscle.
Sarcoplasmic Reticulum
A specialized type of smooth endoplasmic reticulum found in muscle cells, where it stores and releases calcium ions to trigger muscle contraction.
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